Astronomer Jonathan Keohane explains and presents evidence for the Big Bang Theory in this "Ask a High Energy Astronomer" question and response. Links to a glossary of astronomical terms are included. This is part of NASA's "Imagine the Universe" collection of resources on high-energy astronomy.
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This
archive
of
climatic
data
houses
both
national
and
global
datasets
as
part
of
the
National
Climatic
Data
Center's
(NCDC)
mission
to
describe
the
climate
of
the
United
States
and
to
maintain
records
regarding
trends
and
anomalies
of
weather
and
climate.
Users
may
search
the
archive
by
data
type,
national
or
global
coverage,
and
time
period;
or
by
resource
type,
such
as
satellite,
radar,
models,
...
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Grade level:
High (9-12), College (13-14), College (15-16), Graduate / Professional, General public

This
learning
system
provides
a
variety
of
materials
on
Earth
and
space
sciences,
such
as
images,
movies,
animations,
and
data
sets.
Students,
teachers,
and
the
general
public
can
access
information
on
the
sun
and
space
weather,
astronomy,
our
planet
and
solar
system,
current
space
missions,
space-related
mythology
and
art,
and
geology.
For
teachers,
there
are
links
to
tools
for
navigating
the
site,
...
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Geomorphology
from
Space
is
an
out-of-print
1986
NASA
publication
designed
for
use
by
the
remote
sensing,
science,
and
educational
communities
to
study
landforms
and
landscapes.
Users
can
access
a
gallery
of
images
consisting
of
237
plates
arranged
by
particular
types
of
landforms
such
as
tectonic,
volcanic,
planetary,
and
others.
Photographs,
locator
maps,
and
sometimes
a
geologic
map
accompany
the
...
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Watersheds
are
those
land
areas
that
catch
rain
or
snow
and
drain
to
specific
marshes,
streams,
rivers,
lakes,
or
to
ground
water.
This
site
allows
users
to
locate
their
watershed
by
city,
county,
state,
or
region.
Links
provide
information
about
stream
flow,
water
use,
conservation
efforts,
demographics,
forest
riparian
habitats,
science
in
your
watershed,
water
discharges,
and
assessment
of
watershed
...
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Grade level:
Middle (6-8), High (9-12), College (13-14), College (15-16), Graduate / Professional, General public

This educational brief provides an overview of how previously unrevealed information about our galaxy and other celestial objects can be obtained by examining their energy emissions in parts of the electromagnetic spectrum other than that visible to the human eye. Remote imagery of the Milky way in several wavelengths is included, and links to additional information are embedded in the text.
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This educational brief presents a discussion of how the Landsat project has been able to provide data on environmental changes and potential problems. Topics include a short history of the project, an overview of the sorts of environmental issues Landsat satellites are able to "see" from space, and a brief description of ground truthing and how it supports remotely sensed data.
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This tutorial explains the Keplerian elements, the seven numbers which are required to define the orbit of a satellite. Each section addresses one of the elements, giving a literal definition as well as a practical explanation in simple language with some examples of typical numeric values.
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The
home
page
of
the
Astrophysics
Science
Division
at
Goddard
Space
Flight
Center
provides
information
on
the
division's
research
projects,
missions,
goals,
and
activities.
Topics
include
the
evolution
of
galaxies,
stars,
and
planets;
the
diversity
of
worlds
outside
our
solar
system;
the
possibillity
of
life
on
those
worlds;
and
astrophysics
questions
such
as
what
powered
the
Big
Bang,
what
is
dark
...
Full description.

This site discusses the cosmic microwave background, radiation left over from the Big Bang. Particular emphasis is upon tiny fluctuations in the temperature of the radiation, which are believed to reflect fluctuations in the density of matter in the early universe.
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